Hi Ricardo,
On 5/12/21 9:27 AM, Ricardo Koller wrote:
> On Fri, May 07, 2021 at 04:08:07PM +0200, Auger Eric wrote:
>> Hi Ricardo,
>>
>> On 5/6/21 9:14 PM, Ricardo Koller wrote:
>>> On Thu, May 06, 2021 at 02:30:17PM +0200, Auger Eric wrote:
>>>> Hi Ricardo,
>>>>
>>>
>>> Hi Eric,
>>>
>>> Thank you very much for the test.
>>>
>>>> On 5/3/21 9:12 PM, Ricardo Koller wrote:
>>>>> On Mon, May 03, 2021 at 11:32:39AM +0100, Marc Zyngier wrote:
>>>>>> On Sat, 01 May 2021 00:24:06 +0100,
>>>>>> Ricardo Koller <ricarkol@xxxxxxxxxx> wrote:
>>>>>>>
>>>>>>> Add the infrastructure needed to enable exception handling in aarch64
>>>>>>> selftests. The exception handling defaults to an unhandled-exception
>>>>>>> handler which aborts the test, just like x86. These handlers can be
>>>>>>> overridden by calling vm_install_vector_handler(vector) or
>>>>>>> vm_install_exception_handler(vector, ec). The unhandled exception
>>>>>>> reporting from the guest is done using the ucall type introduced in a
>>>>>>> previous commit, UCALL_UNHANDLED.
>>>>>>>
>>>>>>> The exception handling code is heavily inspired on kvm-unit-tests.
>>>>
>>>> running the test on 5.12 I get
>>>>
>
> Hi Eric,
>
> I'm able to reproduce the failure you are seeing on 5.6, specifically
> with kernels older than this commit:
>
> 4942dc6638b0 KVM: arm64: Write arch.mdcr_el2 changes since last vcpu_load on VHE
>
> but not yet on v5.12. Could you share the commit of the kernel you are
> testing, please?
my host is a 5.12 kernel (8404c9fbc84b)
Thanks
Eric
>
> Thanks!
> Ricardo
>
>>>> ==== Test Assertion Failure ====
>>>> aarch64/debug-exceptions.c:232: false
>>>> pid=6477 tid=6477 errno=4 - Interrupted system call
>>>> 1 0x000000000040147b: main at debug-exceptions.c:230
>>>> 2 0x000003ff8aa60de3: ?? ??:0
>>>> 3 0x0000000000401517: _start at :?
>>>> Failed guest assert: hw_bp_addr == PC(hw_bp) at
>>>> aarch64/debug-exceptions.c:105
>>>> values: 0, 0x401794
>>>>
>>>>
>>>> I guess it is not an expected result. Any known bug waiting on the list?
>>>>
>>>
>>> Not expected. That should work, or at least abort early because there is
>>> no HW breakpoints support.
>>>
>>> I'm trying to reproduce the failure; can you help me with some
>>> questions, please?
>> sure, please find the answers below.
>>>
>>> - does your setup have support for hardware breakpoints? Can you try a
>>> 'dmesg | grep break'? I'm looking for something like 'hw-breakpoint:
>>> found ...'. If there is no such line it's very likely that the check
>>> for "debug_ver >= 6" is not enough and the test should check for
>>> "num_breakpoints > 0".
>> [ 25.640418] hw-breakpoint: found 6 breakpoint and 4 watchpoint registers.
>>> - does it fail consistently (every single attempt)?
>> yes it does.
>>
>> I will try to find some time to investigate too
>>
>> Thanks
>>
>> Eric
>>>
>>> Thanks!
>>> Ricardo
>>>
>>>>
>>>> Thanks
>>>>
>>>> Eric
>>>
>>>
>>>>>>>
>>>>>>> Signed-off-by: Ricardo Koller <ricarkol@xxxxxxxxxx>
>>>>>>> ---
>>>>>>> tools/testing/selftests/kvm/Makefile | 2 +-
>>>>>>> .../selftests/kvm/include/aarch64/processor.h | 78 +++++++++++
>>>>>>> .../selftests/kvm/lib/aarch64/handlers.S | 130 ++++++++++++++++++
>>>>>>> .../selftests/kvm/lib/aarch64/processor.c | 124 +++++++++++++++++
>>>>>>> 4 files changed, 333 insertions(+), 1 deletion(-)
>>>>>>> create mode 100644 tools/testing/selftests/kvm/lib/aarch64/handlers.S
>>>>>>>
>>>>>>> diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
>>>>>>> index 4e548d7ab0ab..618c5903f478 100644
>>>>>>> --- a/tools/testing/selftests/kvm/Makefile
>>>>>>> +++ b/tools/testing/selftests/kvm/Makefile
>>>>>>> @@ -35,7 +35,7 @@ endif
>>>>>>>
>>>>>>> LIBKVM = lib/assert.c lib/elf.c lib/io.c lib/kvm_util.c lib/sparsebit.c lib/test_util.c lib/guest_modes.c lib/perf_test_util.c
>>>>>>> LIBKVM_x86_64 = lib/x86_64/processor.c lib/x86_64/vmx.c lib/x86_64/svm.c lib/x86_64/ucall.c lib/x86_64/handlers.S
>>>>>>> -LIBKVM_aarch64 = lib/aarch64/processor.c lib/aarch64/ucall.c
>>>>>>> +LIBKVM_aarch64 = lib/aarch64/processor.c lib/aarch64/ucall.c lib/aarch64/handlers.S
>>>>>>> LIBKVM_s390x = lib/s390x/processor.c lib/s390x/ucall.c lib/s390x/diag318_test_handler.c
>>>>>>>
>>>>>>> TEST_GEN_PROGS_x86_64 = x86_64/cr4_cpuid_sync_test
>>>>>>> diff --git a/tools/testing/selftests/kvm/include/aarch64/processor.h b/tools/testing/selftests/kvm/include/aarch64/processor.h
>>>>>>> index b7fa0c8551db..40aae31b4afc 100644
>>>>>>> --- a/tools/testing/selftests/kvm/include/aarch64/processor.h
>>>>>>> +++ b/tools/testing/selftests/kvm/include/aarch64/processor.h
>>>>>>> @@ -8,6 +8,7 @@
>>>>>>> #define SELFTEST_KVM_PROCESSOR_H
>>>>>>>
>>>>>>> #include "kvm_util.h"
>>>>>>> +#include <linux/stringify.h>
>>>>>>>
>>>>>>>
>>>>>>> #define ARM64_CORE_REG(x) (KVM_REG_ARM64 | KVM_REG_SIZE_U64 | \
>>>>>>> @@ -18,6 +19,7 @@
>>>>>>> #define MAIR_EL1 3, 0, 10, 2, 0
>>>>>>> #define TTBR0_EL1 3, 0, 2, 0, 0
>>>>>>> #define SCTLR_EL1 3, 0, 1, 0, 0
>>>>>>> +#define VBAR_EL1 3, 0, 12, 0, 0
>>>>>>>
>>>>>>> /*
>>>>>>> * Default MAIR
>>>>>>> @@ -56,4 +58,80 @@ void aarch64_vcpu_setup(struct kvm_vm *vm, int vcpuid, struct kvm_vcpu_init *ini
>>>>>>> void aarch64_vcpu_add_default(struct kvm_vm *vm, uint32_t vcpuid,
>>>>>>> struct kvm_vcpu_init *init, void *guest_code);
>>>>>>>
>>>>>>> +struct ex_regs {
>>>>>>> + u64 regs[31];
>>>>>>> + u64 sp;
>>>>>>> + u64 pc;
>>>>>>> + u64 pstate;
>>>>>>> +};
>>>>>>> +
>>>>>>> +#define VECTOR_NUM 16
>>>>>>> +
>>>>>>> +enum {
>>>>>>> + VECTOR_SYNC_CURRENT_SP0,
>>>>>>> + VECTOR_IRQ_CURRENT_SP0,
>>>>>>> + VECTOR_FIQ_CURRENT_SP0,
>>>>>>> + VECTOR_ERROR_CURRENT_SP0,
>>>>>>> +
>>>>>>> + VECTOR_SYNC_CURRENT,
>>>>>>> + VECTOR_IRQ_CURRENT,
>>>>>>> + VECTOR_FIQ_CURRENT,
>>>>>>> + VECTOR_ERROR_CURRENT,
>>>>>>> +
>>>>>>> + VECTOR_SYNC_LOWER_64,
>>>>>>> + VECTOR_IRQ_LOWER_64,
>>>>>>> + VECTOR_FIQ_LOWER_64,
>>>>>>> + VECTOR_ERROR_LOWER_64,
>>>>>>> +
>>>>>>> + VECTOR_SYNC_LOWER_32,
>>>>>>> + VECTOR_IRQ_LOWER_32,
>>>>>>> + VECTOR_FIQ_LOWER_32,
>>>>>>> + VECTOR_ERROR_LOWER_32,
>>>>>>> +};
>>>>>>> +
>>>>>>> +#define VECTOR_IS_SYNC(v) ((v) == VECTOR_SYNC_CURRENT_SP0 || \
>>>>>>> + (v) == VECTOR_SYNC_CURRENT || \
>>>>>>> + (v) == VECTOR_SYNC_LOWER_64 || \
>>>>>>> + (v) == VECTOR_SYNC_LOWER_32)
>>>>>>> +
>>>>>>> +/* Some common EC (Exception classes) */
>>>>>>> +#define ESR_EC_ILLEGAL_INS 0x0e
>>>>>>> +#define ESR_EC_SVC64 0x15
>>>>>>> +#define ESR_EC_IABORT_CURRENT 0x21
>>>>>>> +#define ESR_EC_DABORT_CURRENT 0x25
>>>>>>> +#define ESR_EC_SERROR 0x2f
>>>>>>> +#define ESR_EC_HW_BP_CURRENT 0x31
>>>>>>> +#define ESR_EC_SSTEP_CURRENT 0x33
>>>>>>> +#define ESR_EC_WP_CURRENT 0x35
>>>>>>> +#define ESR_EC_BRK_INS 0x3C
>>>>>>> +
>>>>>>> +#define ESR_EC_NUM 64
>>>>>>> +
>>>>>>> +#define ESR_EC_SHIFT 26
>>>>>>> +#define ESR_EC_MASK (ESR_EC_NUM - 1)
>>>>>>> +
>>>>>>> +void vm_init_descriptor_tables(struct kvm_vm *vm);
>>>>>>> +void vcpu_init_descriptor_tables(struct kvm_vm *vm, uint32_t vcpuid);
>>>>>>> +
>>>>>>> +typedef void(*handler_fn)(struct ex_regs *);
>>>>>>> +void vm_install_exception_handler(struct kvm_vm *vm,
>>>>>>> + int vector, int ec, handler_fn handler);
>>>>>>> +void vm_install_vector_handler(struct kvm_vm *vm,
>>>>>>> + int vector, handler_fn handler);
>>>>>>> +
>>>>>>> +#define SPSR_D (1 << 9)
>>>>>>> +#define SPSR_SS (1 << 21)
>>>>>>> +
>>>>>>> +#define write_sysreg(reg, val) \
>>>>>>> +({ \
>>>>>>> + u64 __val = (u64)(val); \
>>>>>>> + asm volatile("msr " __stringify(reg) ", %x0" : : "rZ" (__val)); \
>>>>>>> +})
>>>>>>> +
>>>>>>> +#define read_sysreg(reg) \
>>>>>>> +({ u64 val; \
>>>>>>> + asm volatile("mrs %0, "__stringify(reg) : "=r"(val) : : "memory");\
>>>>>>> + val; \
>>>>>>> +})
>>>>>>> +
>>>>>>> #endif /* SELFTEST_KVM_PROCESSOR_H */
>>>>>>> diff --git a/tools/testing/selftests/kvm/lib/aarch64/handlers.S b/tools/testing/selftests/kvm/lib/aarch64/handlers.S
>>>>>>> new file mode 100644
>>>>>>> index 000000000000..8a560021892b
>>>>>>> --- /dev/null
>>>>>>> +++ b/tools/testing/selftests/kvm/lib/aarch64/handlers.S
>>>>>>> @@ -0,0 +1,130 @@
>>>>>>> +/* SPDX-License-Identifier: GPL-2.0 */
>>>>>>> +.macro save_registers, vector
>>>>>>> + add sp, sp, #-16 * 17
>>>>>>> +
>>>>>>> + stp x0, x1, [sp, #16 * 0]
>>>>>>> + stp x2, x3, [sp, #16 * 1]
>>>>>>> + stp x4, x5, [sp, #16 * 2]
>>>>>>> + stp x6, x7, [sp, #16 * 3]
>>>>>>> + stp x8, x9, [sp, #16 * 4]
>>>>>>> + stp x10, x11, [sp, #16 * 5]
>>>>>>> + stp x12, x13, [sp, #16 * 6]
>>>>>>> + stp x14, x15, [sp, #16 * 7]
>>>>>>> + stp x16, x17, [sp, #16 * 8]
>>>>>>> + stp x18, x19, [sp, #16 * 9]
>>>>>>> + stp x20, x21, [sp, #16 * 10]
>>>>>>> + stp x22, x23, [sp, #16 * 11]
>>>>>>> + stp x24, x25, [sp, #16 * 12]
>>>>>>> + stp x26, x27, [sp, #16 * 13]
>>>>>>> + stp x28, x29, [sp, #16 * 14]
>>>>>>> +
>>>>>>> + .if \vector >= 8
>>>>>>> + mrs x1, sp_el0
>>>>>>
>>>>>> I'm still a bit perplexed by this. SP_EL0 is never changed, since you
>>>>>> always run in handler mode. Therefore, saving/restoring it is only
>>>>>> overhead. If an exception handler wants to introspect it, it is
>>>>>> already available in the relevant system register.
>>>>>>
>>>>>> Or did you have something else in mind for it?
>>>>>>
>>>>>
>>>>> Not really. The reason for saving sp_el0 in there was just for
>>>>> consistency, so that handlers for both el0 and el1 exceptions could get
>>>>> the sp at regs->sp.
>>>>>
>>>>> Restoring sp_el0 might be too much. So, what do you think of this v3: we
>>>>> keep the saving of sp_el0 into regs->sp (to keep things the same between
>>>>> el0 and el1) and delete the restoring of sp_el0?
>>>>>
>>>>> Thanks,
>>>>> Ricardo
>>>>>
>>>>>>> + .else
>>>>>>> + /*
>>>>>>> + * This stores sp_el1 into ex_regs.sp so exception handlers can
>>>>>>> + * "look" at it. It will _not_ be used to restore the sp_el1 on
>>>>>>> + * return from the exception so handlers can not update it.
>>>>>>> + */
>>>>>>> + mov x1, sp
>>>>>>> + .endif
>>>>>>> + stp x30, x1, [sp, #16 * 15] /* x30, SP */
>>>>>>> +
>>>>>>> + mrs x1, elr_el1
>>>>>>> + mrs x2, spsr_el1
>>>>>>> + stp x1, x2, [sp, #16 * 16] /* PC, PSTATE */
>>>>>>> +.endm
>>>>>>> +
>>>>>>> +.macro restore_registers, vector
>>>>>>> + ldp x1, x2, [sp, #16 * 16] /* PC, PSTATE */
>>>>>>> + msr elr_el1, x1
>>>>>>> + msr spsr_el1, x2
>>>>>>> +
>>>>>>> + ldp x30, x1, [sp, #16 * 15] /* x30, SP */
>>>>>>> + .if \vector >= 8
>>>>>>> + msr sp_el0, x1
>>>>>>> + .endif
>>>>>>> +
>>>>>>> + ldp x28, x29, [sp, #16 * 14]
>>>>>>> + ldp x26, x27, [sp, #16 * 13]
>>>>>>> + ldp x24, x25, [sp, #16 * 12]
>>>>>>> + ldp x22, x23, [sp, #16 * 11]
>>>>>>> + ldp x20, x21, [sp, #16 * 10]
>>>>>>> + ldp x18, x19, [sp, #16 * 9]
>>>>>>> + ldp x16, x17, [sp, #16 * 8]
>>>>>>> + ldp x14, x15, [sp, #16 * 7]
>>>>>>> + ldp x12, x13, [sp, #16 * 6]
>>>>>>> + ldp x10, x11, [sp, #16 * 5]
>>>>>>> + ldp x8, x9, [sp, #16 * 4]
>>>>>>> + ldp x6, x7, [sp, #16 * 3]
>>>>>>> + ldp x4, x5, [sp, #16 * 2]
>>>>>>> + ldp x2, x3, [sp, #16 * 1]
>>>>>>> + ldp x0, x1, [sp, #16 * 0]
>>>>>>> +
>>>>>>> + add sp, sp, #16 * 17
>>>>>>> +
>>>>>>> + eret
>>>>>>> +.endm
>>>>>>> +
>>>>>>> +.pushsection ".entry.text", "ax"
>>>>>>> +.balign 0x800
>>>>>>> +.global vectors
>>>>>>> +vectors:
>>>>>>> +.popsection
>>>>>>> +
>>>>>>> +.set vector, 0
>>>>>>> +
>>>>>>> +/*
>>>>>>> + * Build an exception handler for vector and append a jump to it into
>>>>>>> + * vectors (while making sure that it's 0x80 aligned).
>>>>>>> + */
>>>>>>> +.macro HANDLER, label
>>>>>>> +handler_\()\label:
>>>>>>> + save_registers vector
>>>>>>> + mov x0, sp
>>>>>>> + mov x1, #vector
>>>>>>> + bl route_exception
>>>>>>> + restore_registers vector
>>>>>>> +
>>>>>>> +.pushsection ".entry.text", "ax"
>>>>>>> +.balign 0x80
>>>>>>> + b handler_\()\label
>>>>>>> +.popsection
>>>>>>> +
>>>>>>> +.set vector, vector + 1
>>>>>>> +.endm
>>>>>>> +
>>>>>>> +.macro HANDLER_INVALID
>>>>>>> +.pushsection ".entry.text", "ax"
>>>>>>> +.balign 0x80
>>>>>>> +/* This will abort so no need to save and restore registers. */
>>>>>>> + mov x0, #vector
>>>>>>> + b kvm_exit_unexpected_vector
>>>>>>> +.popsection
>>>>>>> +
>>>>>>> +.set vector, vector + 1
>>>>>>> +.endm
>>>>>>> +
>>>>>>> +/*
>>>>>>> + * Caution: be sure to not add anything between the declaration of vectors
>>>>>>> + * above and these macro calls that will build the vectors table below it.
>>>>>>> + */
>>>>>>> + HANDLER_INVALID // Synchronous EL1t
>>>>>>> + HANDLER_INVALID // IRQ EL1t
>>>>>>> + HANDLER_INVALID // FIQ EL1t
>>>>>>> + HANDLER_INVALID // Error EL1t
>>>>>>> +
>>>>>>> + HANDLER el1h_sync // Synchronous EL1h
>>>>>>> + HANDLER el1h_irq // IRQ EL1h
>>>>>>> + HANDLER el1h_fiq // FIQ EL1h
>>>>>>> + HANDLER el1h_error // Error EL1h
>>>>>>> +
>>>>>>> + HANDLER el0_sync_64 // Synchronous 64-bit EL0
>>>>>>> + HANDLER el0_irq_64 // IRQ 64-bit EL0
>>>>>>> + HANDLER el0_fiq_64 // FIQ 64-bit EL0
>>>>>>> + HANDLER el0_error_64 // Error 64-bit EL0
>>>>>>> +
>>>>>>> + HANDLER el0_sync_32 // Synchronous 32-bit EL0
>>>>>>> + HANDLER el0_irq_32 // IRQ 32-bit EL0
>>>>>>> + HANDLER el0_fiq_32 // FIQ 32-bit EL0
>>>>>>> + HANDLER el0_error_32 // Error 32-bit EL0
>>>>>>> diff --git a/tools/testing/selftests/kvm/lib/aarch64/processor.c b/tools/testing/selftests/kvm/lib/aarch64/processor.c
>>>>>>> index cee92d477dc0..25be71ec88be 100644
>>>>>>> --- a/tools/testing/selftests/kvm/lib/aarch64/processor.c
>>>>>>> +++ b/tools/testing/selftests/kvm/lib/aarch64/processor.c
>>>>>>> @@ -6,6 +6,7 @@
>>>>>>> */
>>>>>>>
>>>>>>> #include <linux/compiler.h>
>>>>>>> +#include <assert.h>
>>>>>>>
>>>>>>> #include "kvm_util.h"
>>>>>>> #include "../kvm_util_internal.h"
>>>>>>> @@ -14,6 +15,8 @@
>>>>>>> #define KVM_GUEST_PAGE_TABLE_MIN_PADDR 0x180000
>>>>>>> #define DEFAULT_ARM64_GUEST_STACK_VADDR_MIN 0xac0000
>>>>>>>
>>>>>>> +vm_vaddr_t exception_handlers;
>>>>>>> +
>>>>>>> static uint64_t page_align(struct kvm_vm *vm, uint64_t v)
>>>>>>> {
>>>>>>> return (v + vm->page_size) & ~(vm->page_size - 1);
>>>>>>> @@ -334,6 +337,127 @@ void vcpu_args_set(struct kvm_vm *vm, uint32_t vcpuid, unsigned int num, ...)
>>>>>>> va_end(ap);
>>>>>>> }
>>>>>>>
>>>>>>> +void kvm_exit_unexpected_vector(int vector)
>>>>>>> +{
>>>>>>> + ucall(UCALL_UNHANDLED, 3, vector, 0, false /* !valid_ec */);
>>>>>>> +}
>>>>>>> +
>>>>>>> +void kvm_exit_unexpected_exception(int vector, uint64_t ec)
>>>>>>> +{
>>>>>>> + ucall(UCALL_UNHANDLED, 3, vector, ec, true /* valid_ec */);
>>>>>>> +}
>>>>>>> +
>>>>>>> void assert_on_unhandled_exception(struct kvm_vm *vm, uint32_t vcpuid)
>>>>>>> {
>>>>>>> + struct ucall uc;
>>>>>>> +
>>>>>>> + if (get_ucall(vm, vcpuid, &uc) != UCALL_UNHANDLED)
>>>>>>> + return;
>>>>>>> +
>>>>>>> + if (uc.args[2]) /* valid_ec */ {
>>>>>>> + assert(VECTOR_IS_SYNC(uc.args[0]));
>>>>>>> + TEST_ASSERT(false,
>>>>>>> + "Unexpected exception (vector:0x%lx, ec:0x%lx)",
>>>>>>> + uc.args[0], uc.args[1]);
>>>>>>> + } else {
>>>>>>> + assert(!VECTOR_IS_SYNC(uc.args[0]));
>>>>>>> + TEST_ASSERT(false,
>>>>>>> + "Unexpected exception (vector:0x%lx)",
>>>>>>> + uc.args[0]);
>>>>>>> + }
>>>>>>> +}
>>>>>>> +
>>>>>>> +/*
>>>>>>> + * This exception handling code was heavily inspired on kvm-unit-tests. There
>>>>>>> + * is a set of default vector handlers stored in vector_handlers. These default
>>>>>>> + * vector handlers call user-installed handlers stored in exception_handlers.
>>>>>>> + * Synchronous handlers are indexed by (vector, ec), and irq handlers by
>>>>>>> + * (vector, ec=0).
>>>>>>> + */
>>>>>>> +
>>>>>>> +typedef void(*vector_fn)(struct ex_regs *, int vector);
>>>>>>> +
>>>>>>> +struct handlers {
>>>>>>> + vector_fn vector_handlers[VECTOR_NUM];
>>>>>>> + handler_fn exception_handlers[VECTOR_NUM][ESR_EC_NUM];
>>>>>>> +};
>>>>>>> +
>>>>>>> +void vcpu_init_descriptor_tables(struct kvm_vm *vm, uint32_t vcpuid)
>>>>>>> +{
>>>>>>> + extern char vectors;
>>>>>>> +
>>>>>>> + set_reg(vm, vcpuid, ARM64_SYS_REG(VBAR_EL1), (uint64_t)&vectors);
>>>>>>> +}
>>>>>>> +
>>>>>>> +void default_sync_handler(struct ex_regs *regs, int vector)
>>>>>>> +{
>>>>>>> + struct handlers *handlers = (struct handlers *)exception_handlers;
>>>>>>> + uint64_t esr = read_sysreg(esr_el1);
>>>>>>> + uint64_t ec = (esr >> ESR_EC_SHIFT) & ESR_EC_MASK;
>>>>>>> +
>>>>>>> + GUEST_ASSERT(VECTOR_IS_SYNC(vector));
>>>>>>> +
>>>>>>> + if (handlers && handlers->exception_handlers[vector][ec])
>>>>>>> + handlers->exception_handlers[vector][ec](regs);
>>>>>>> + else
>>>>>>> + kvm_exit_unexpected_exception(vector, ec);
>>>>>>> +}
>>>>>>> +
>>>>>>> +void default_irq_handler(struct ex_regs *regs, int vector)
>>>>>>> +{
>>>>>>> + struct handlers *handlers = (struct handlers *)exception_handlers;
>>>>>>> +
>>>>>>> + GUEST_ASSERT(!VECTOR_IS_SYNC(vector));
>>>>>>> +
>>>>>>> + if (handlers && handlers->exception_handlers[vector][0])
>>>>>>> + handlers->exception_handlers[vector][0](regs);
>>>>>>> + else
>>>>>>> + kvm_exit_unexpected_vector(vector);
>>>>>>> +}
>>>>>>> +
>>>>>>> +void route_exception(struct ex_regs *regs, int vector)
>>>>>>> +{
>>>>>>> + struct handlers *handlers = (struct handlers *)exception_handlers;
>>>>>>> +
>>>>>>> + if (handlers && handlers->vector_handlers[vector])
>>>>>>> + handlers->vector_handlers[vector](regs, vector);
>>>>>>> + else
>>>>>>> + kvm_exit_unexpected_vector(vector);
>>>>>>> +}
>>>>>>> +
>>>>>>> +void vm_init_descriptor_tables(struct kvm_vm *vm)
>>>>>>> +{
>>>>>>> + struct handlers *handlers;
>>>>>>> +
>>>>>>> + vm->handlers = vm_vaddr_alloc(vm, sizeof(struct handlers),
>>>>>>> + vm->page_size, 0, 0);
>>>>>>> +
>>>>>>> + handlers = (struct handlers *)addr_gva2hva(vm, vm->handlers);
>>>>>>> + handlers->vector_handlers[VECTOR_SYNC_CURRENT] = default_sync_handler;
>>>>>>> + handlers->vector_handlers[VECTOR_IRQ_CURRENT] = default_irq_handler;
>>>>>>> + handlers->vector_handlers[VECTOR_SYNC_LOWER_64] = default_sync_handler;
>>>>>>> + handlers->vector_handlers[VECTOR_IRQ_LOWER_64] = default_irq_handler;
>>>>>>
>>>>>> How about FIQ, Error? Although they are unlikely, they are valid
>>>>>> exceptions.
>>>>>>
>>>>>>> +
>>>>>>> + *(vm_vaddr_t *)addr_gva2hva(vm, (vm_vaddr_t)(&exception_handlers)) = vm->handlers;
>>>>>>> +}
>>>>>>> +
>>>>>>> +void vm_install_exception_handler(struct kvm_vm *vm, int vector, int ec,
>>>>>>> + void (*handler)(struct ex_regs *))
>>>>>>> +{
>>>>>>> + struct handlers *handlers = (struct handlers *)addr_gva2hva(vm, vm->handlers);
>>>>>>> +
>>>>>>> + assert(VECTOR_IS_SYNC(vector));
>>>>>>> + assert(vector < VECTOR_NUM);
>>>>>>> + assert(ec < ESR_EC_NUM);
>>>>>>> + handlers->exception_handlers[vector][ec] = handler;
>>>>>>> +}
>>>>>>> +
>>>>>>> +void vm_install_vector_handler(struct kvm_vm *vm, int vector,
>>>>>>> + void (*handler)(struct ex_regs *))
>>>>>>> +{
>>>>>>> + struct handlers *handlers = (struct handlers *)addr_gva2hva(vm, vm->handlers);
>>>>>>> +
>>>>>>> + assert(!VECTOR_IS_SYNC(vector));
>>>>>>> + assert(vector < VECTOR_NUM);
>>>>>>> + handlers->exception_handlers[vector][0] = handler;
>>>>>>> }
>>>>>>
>>>>>> Thanks,
>>>>>>
>>>>>> M.
>>>>>>
>>>>>> --
>>>>>> Without deviation from the norm, progress is not possible.
>>>>>
>>>>
>>>
>>
>
